Canon has released firmware updates for several of its current RF lens line-up to add compatibility for the EOS R5 and R6 cameras.
The new firmware adds core functionality to the lens image stabilisation (IS) features to enable the lenses to work together with the new in-body image stabilisation (IBIS) system introduced with the EOS R5 and R6 cameras.
The following lenses have new firmware versions available, with links below to download the firmware.
Canon RF 15-35mm f2.8L IS USM
Canon RF 24-70mm f2.8L IS USM
Canon RF 24-105mm f4-7.1 IS STM
Canon RF 24-105mm f4L IS USM
Canon RF 24-240mm f4-6.3 IS USM
Canon RF 35mm f1.8 Macro IS STM
Canon RF 70-200mm f2.8L IS USM